Kandi 150 cc gkm-2
 

Need help having trouble don't know were to start have a 150 cc kandi and have very to little to no compression and have alot of air coming out the valve cover air vent while cranking over engine...I can't tell if it jumped time or if piston and rings are bad could someone help thanks

First re time the engine to eliminate that possibility. Look on you tube for a timing video. It's real easy to do.

Yep, check your valve timing for sure.

Also check your valve clearances while you're in there.

Lastly, check your timing chain tensioner is good.

Youtube GY6 valve adjustment for a video